The Alfa Romeo AR 67303 is a 1,750 cc, inline-four turbocharged petrol engine produced between 2016 and 2020. It serves as a higher-tuned evolution of the AR 67299 platform, delivering 177 kW (240 PS) and 340 Nm of torque. This engine features direct fuel injection, dual variable valve timing (Dual VVT), and a compact BorgWarner EFR turbocharger, enabling rapid throttle response and strong mid-range performance typical of Alfa Romeo's sport-focused engineering.
Fitted exclusively to the Giulia Quadrifoglio and early Stelvio Quadrifoglio models, the AR 67303 was engineered for high-performance driving dynamics and track capability. It balances aggressive power delivery with drivability in everyday conditions. Emissions compliance is achieved through close-coupled catalytic converters and advanced engine management, meeting Euro 6b standards across all production years (VCA UK Type Approval #VCA/EMS/5679).
One documented characteristic is the use of a reinforced crankshaft and forged connecting rods, as specified in Alfa Romeo Technical Bulletin 61/2017, to handle increased cylinder pressures. The engine also incorporates an integrated starter-generator system for mild hybrid functionality in post-2018 builds, improving throttle response during transient acceleration and enabling brief coasting modes.
All production years (2016–2020) comply with Euro 6b emissions standards (VCA UK Type Approval #VCA/EMS/5679).
The Alfa Romeo AR 67303 is a 1,750 cc inline‑four turbocharged petrol engine engineered for high-performance applications (2016–2020). It combines direct fuel injection with dual variable valve timing and a high-flow turbocharger to deliver race-inspired throttle response and sustained power output. Designed to meet Euro 6b emissions standards, it integrates performance with regulatory requirements.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,750 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 84.0 mm × 78.0 mm | |
| Power output | 177 kW (240 PS) @ 5,700–6,500 rpm | |
| Torque | 340 Nm @ 2,000–4,500 rpm | |
| Fuel system | Direct injection (up to 200 bar) | |
| Emissions standard | Euro 6b | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single BorgWarner EFR turbo with internal wastegate | |
| Timing system | Chain-driven (integrated in rear cover) | |
| Oil type | SAE 5W-40, API SN/CF, ACEA A3/B4 | |
| Dry weight | 128 kg |
The high-output tune demands consistent use of premium unleaded fuel (RON 98) to prevent knock and maintain performance. SAE 5W-40 ACEA A3/B4 oil is essential for turbo and timing system protection under high thermal loads. Short oil intervals (10,000 km or 12 months) are recommended to prevent coking in the turbo actuator and oil lines. Fuel quality must meet EN 228 standards to avoid injector fouling. The integrated starter-generator in post-2018 models requires compatible battery management and ECU calibration. The engine’s high specific output increases thermal stress on the cylinder head, necessitating proper warm-up and cool-down procedures.
Oil Specs: Requires ACEA A3/B4 specification (Alfa Romeo SIB 59/2018). BMW Longlife-04 not approved.
Emissions: All units comply with Euro 6b (VCA Type Approval #VCA/EMS/5679). No Euro 5 variant exists.
Power Ratings: Measured under SAE J1349 standards. 177 kW output requires RON 98 fuel (Alfa Romeo TIS AR-ENG-67303).
Alfa Romeo Technical Information System (TIS): Docs AR-ENG-67303, AR-TURBO-01, SIB 59/2018
VCA Type Approval Database (VCA/EMS/5679)
SAE International: J1349 Engine Power Certification Standards
The Alfa Romeo AR 67303 was used in Alfa Romeo's high-performance 952/956 platforms with longitudinal mounting and rear-wheel-drive layout. This engine received performance-specific adaptations—forged internals, high-flow turbo, and charge cooling—from launch. From 2018, the Stelvio Quadrifoglio adopted the same calibration as the Giulia, with identical ECU maps and boost curves. All variants are documented in OEM technical bulletins and require specific service procedures.
Locate the engine code stamped on the right-side engine block near the transmission bellhousing (Alfa Romeo TIS AR-ENG-ID1). The 8th VIN digit indicates engine type ('C' for AR 67303 series). All units have black valve covers with red 'Quadrifoglio' branding. Critical differentiation from AR 67299: AR 67303 uses a high-flow BorgWarner EFR turbo with revised compressor housing and higher boost pressure (1.8 bar vs 1.4 bar). Service parts are not interchangeable with non-Quadrifoglio engines. Production date verification is required for starter-generator compatibility in post-2018 models.
The AR 67303's primary reliability risk is thermal stress on the turbocharger actuator and intercooler plumbing under sustained high-load driving. Internal Alfa Romeo field reports from 2020 indicated a moderate incidence of intercooler pipe leaks in track-driven examples, while UK DVSA records show few emissions-related MOT failures due to robust emissions calibration. Aggressive driving and poor maintenance increase risk, making oil quality and cooling system integrity critical.
Analysis derived from Alfa Romeo technical bulletins (2016-2020) and UK DVSA failure statistics (2017-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR67303.
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Regulation (EC) No 715/2007
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